Class 10ScienceMagnetic Effects of Electric CurrentMix Examples - Magnetic Effects of Electric Current
MediumState the condition for electromagnetic induction to take place. $A$ cylindrical bar magnet is kept along the axis of a circular coil as shown in the figure. Will there be a current induced in the coil if the magnet is rotated about its axis? Discuss.
(N/A) The condition for electromagnetic induction to occur is that there must be a change in the magnetic flux linked with the coil.
This change in magnetic flux can be achieved by:
$(a)$ Relative motion between the coil and the magnet.
$(b)$ Changing the current in a nearby coil.
In the given scenario,when the cylindrical bar magnet is rotated about its own axis,the magnetic field lines associated with the magnet remain symmetric with respect to the axis of rotation. Consequently,the magnetic flux passing through the circular coil does not change over time. Since there is no change in the magnetic flux linked with the coil,no current will be induced in the coil.
This change in magnetic flux can be achieved by:
$(a)$ Relative motion between the coil and the magnet.
$(b)$ Changing the current in a nearby coil.
In the given scenario,when the cylindrical bar magnet is rotated about its own axis,the magnetic field lines associated with the magnet remain symmetric with respect to the axis of rotation. Consequently,the magnetic flux passing through the circular coil does not change over time. Since there is no change in the magnetic flux linked with the coil,no current will be induced in the coil.
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Similar Questions
$(a)$ $A$ coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is:
$(i)$ pushed into the coil with its north pole entering first?
$(ii)$ withdrawn from inside the coil?
$(iii)$ held stationary inside the coil?
$(b)$ Name the above phenomenon and mention the name of the scientist who discovered it. State the law that relates the direction of current in the coil with the direction of motion of the magnet.
$(i)$ pushed into the coil with its north pole entering first?
$(ii)$ withdrawn from inside the coil?
$(iii)$ held stationary inside the coil?
$(b)$ Name the above phenomenon and mention the name of the scientist who discovered it. State the law that relates the direction of current in the coil with the direction of motion of the magnet.
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